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106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*-
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* Copyright (c) 2003-2007 Joseph Koshy
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* Copyright (c) 2007 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by A. Joseph Koshy under
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* sponsorship from the FreeBSD Foundation and Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_hwpmc_hooks.h"
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#include <sys/types.h>
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#include <sys/pmc.h>
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#include <sys/pmckern.h>
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#include <sys/smp.h>
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#ifdef HWPMC_HOOKS
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#define PMC_KERNEL_VERSION PMC_VERSION
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#else
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#define PMC_KERNEL_VERSION 0
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#endif
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const int pmc_kernel_version = PMC_KERNEL_VERSION;
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/* Hook variable. */
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int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
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/* Interrupt handler */
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int (*pmc_intr)(int cpu, struct trapframe *tf) = NULL;
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/* Bitmask of CPUs requiring servicing at hardclock time */
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volatile cpumask_t pmc_cpumask;
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/*
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* A global count of SS mode PMCs. When non-zero, this means that
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* we have processes that are sampling the system as a whole.
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*/
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volatile int pmc_ss_count;
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/*
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* Since PMC(4) may not be loaded in the current kernel, the
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* convention followed is that a non-NULL value of 'pmc_hook' implies
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* the presence of this kernel module.
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*
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* This requires us to protect 'pmc_hook' with a
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* shared (sx) lock -- thus making the process of calling into PMC(4)
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* somewhat more expensive than a simple 'if' check and indirect call.
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*/
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struct sx pmc_sx;
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static void
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pmc_init_sx(void)
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{
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sx_init_flags(&pmc_sx, "pmc-sx", SX_NOWITNESS);
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}
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SYSINIT(pmcsx, SI_SUB_LOCK, SI_ORDER_MIDDLE, pmc_init_sx, NULL);
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/*
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* Helper functions
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*/
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int
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pmc_cpu_is_disabled(int cpu)
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{
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#ifdef SMP
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return ((hlt_cpus_mask & (1 << cpu)) != 0);
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#else
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return 0;
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#endif
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}
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int
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pmc_cpu_is_logical(int cpu)
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{
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#ifdef SMP
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return ((logical_cpus_mask & (1 << cpu)) != 0);
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#else
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return 0;
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#endif
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}
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